What is the Sandstone QSFP-40G-SR-S-ST?
The Sandstone QSFP-40G-SR-S-ST is a QSFP optical transceiver module, listed by the manufacturer as "Cisco Compatible QSFP Module, 40GBase-SR4- 850nm, MPO Multimode DDM)". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.